Vega Capacitive electrodes EK … with signal conditionin Bedienungsanleitung PDF herunterladen (Seite 20)

20 Capacitive electrodes EK with signal conditioning instrument

Mounting

Fig. 2.4 Humidity

Humidity from outside

After installation turn the cable entries of

horizontally mounted instruments to the bot-

tom to avoid humidity ingress. The instrument

housing is rotational by approx. 330°. In case

of vertically installed electrodes, loop the

connection line to the electrode housing to the

bottom so that rain or condensation water

can drain off.

This is mainly valid for mounting outside, in

areas where humidity must be expected

(e.g. by cleaning processes) or on cooled or

heated vessels (see fig. 2.4).

Cable entries

When mounting outside, on cooled vessels or

in humid areas where cleaning is made e.g.

with steam or high pressure, the sealing of

the cable entry is very important.

Use cable with a round cross-section area of

conductor and tighten the cable entry. The

cable entry is suitable for cable diameters of

5 mm to 9 mm.

Aluminium vessels

Use for Aluminium vessels an electrode with

steel thread. The combination Aluminium on

Aluminium should be avoided, as the thread

"seizes“ when being screwed and cannot be

loosened after some time without being dam-

aged.

Metal vessels

Note that the mechanical connection of the

electrode is electrically conductive connected

with the vessel to ensure sufficient earth.

Use conductive seals such as e.g. copper,

lead etc. Isolating measures such as cover-

ing the thread with Teflon tape can interrupt

the necessary electrical connection. In this

case use the earth terminal on the housing to

connect the electrode to the vessel wall.

Non-conductive vessels

In non-conductive vessels, e.g. plastic tanks,

the second pole of the capacitor must be

provided separately, e.g. by a concentric

tube or the use of a double rod electrode.

When using a standard electrode, a suitable

earth plate is necessary. Hence provide a

possibly large earth plate, e.g. wire braiding

laminated into the vessel wall or metal foil

which is glued to the vessel. Connect the

earth plate with the earth terminal on the

housing.

Rod electrode

Mount the electrode such that the electrode

protrudes into the vessel. When mounting in

a tube or a socket, build-up can be caused

which can influence the measurement. This is

particularly the case with viscous or adhesive

products.

(see fig. 2.5)

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